diff --git a/src/seismic_hazard_forecasting.py b/src/seismic_hazard_forecasting.py
index 24880b5..4ebc6ba 100644
--- a/src/seismic_hazard_forecasting.py
+++ b/src/seismic_hazard_forecasting.py
@@ -366,7 +366,9 @@ verbose: {verbose}")
 
         # Assign probabilities 
         lambdas, lambdas_perc = lambda_probs(act_rate, dates_calc, bin_edges)
-
+        lambdas = np.array(lambdas, dtype='d')
+        lambdas_perc = np.array(lambdas_perc, dtype='d')
+        
         # print("Forecasted activity rates: ", lambdas, "events per", time_unit[:-1])
         logger.info(f"Forecasted activity rates: {lambdas} events per {time_unit} with percentages {lambdas_perc}")
         np.savetxt('activity_rate.csv', np.vstack((lambdas, lambdas_perc)).T, header="lambda, percentage",